Activation of the gluteus medius according to load during horizontal hip abduction in a one-leg stance

Abstract

[Purpose] This study researched the influences of different loads on muscle activity of the posterior fibers of the gluteus medius in a one-leg standing position. [Subjects] Twenty-four healthy adult men participated in this study. [Methods] All participants performed the one-leg standing position under four conditions: the standard no-load condition, in which the non-weight-bearing leg was lifted and kept parallel to the back and then pelvic or lumbar rotation was performed without thorax rotation, and the 0 kg, 1 kg, and 3 kg load conditions, in which horizontal shoulder abduction was performed with a load of 0 kg, 1 kg, or 3 kg added to the hand. The electromyographic activity of the posterior fibers of the gluteus medius was measured using a wireless surface electromyography under all conditions. The electromyographic activity of each muscle under the four conditions during the one-leg stance was analyzed using one-way analysis of variance. [Results] The electromyographic activity of the posterior fiber of the gluteus medius was significantly increased under the 3 kg load condition compared with the no-load, 0 kg load, and 1 kg load conditions. [Conclusion] These findings indicated that muscle activation is affected by increases in load in the one-leg standing position. The load on the upper extremity influences the muscle activity of the contralateral lower extremity.

Effect of Neuromuscular Exercises on Pain, Quadriceps Strength and Physical Function among Patients with Unilateral Knee Osteoarthritis. -a Single Group Reversal Design

“…The knee joint load is influenced by functional alignment of the trunk, pelvis and lower limb segments. Neuromuscular Exercises can influence knee joint load and decrease pain, improve balance, muscle activation, functional alignment and functional knee stability (Lee Kim & Koo, 2015). Neuromuscular exercise and Hip Abduction: KOCH' s Static Model of Hip Biomechanics states that "Gluteus Medius must generate force twice the weight of the body during single leg stance" to prevent the body from leaning towards the unsupported side.…”

“…Neuromuscular exercise and Hip Abduction: KOCH' s Static Model of Hip Biomechanics states that "Gluteus Medius must generate force twice the weight of the body during single leg stance" to prevent the body from leaning towards the unsupported side. In this mode, Gluteus Medius is the only muscle that provides resistance to the loads exerted on the femur (Lee Kim & Koo, 2015) In single-limb stance, the ground reaction force applies an addiction moment to the stance hip, tending to rotate the whole lower extremity medially.…”